DeviantART member jablechien marked a sword with the cutie mark and traditional icon of Princess Luna, a character on My Little Pony: Friendship Is Magic. He did so by applying acrylic paint with a toothpick.

(Image: Hasbro Studios)

Jablechien writes that he did this "for the glory of the New Lunar Republic!" This is a reference to a major body of fan fiction which places Luna (pictured above) and her sister Princess Celestia at war with each other.

My position on this as a brony: in keeping with the 34th Rule of Acquisition, stay neutral in this conflict and sell weapons to both sides.